Lens grinding machine



Aug. 18, 1936.

J. A. COOK LENS GRINDING MACHINE Filed Sept. 3, 1935 2 Sheets-Sheet l f/ aaokmvemon ATTORNEY Aug. 18, 1936. J. A. COOK LENS GRINDING MACHINE Filed Sept. 5, 1935 2 Sheets-Sheet 2 INVENTOR ATTORNEY Patented Aug. 18, I936 UNITED STATES LENS GRINDING MACHINE John Albert Cook, Birmingham, Ala., assignor of one-half to Jay W. Stack, Mobile, Ala.

Application September 3, 1935, Serial No. 39,019

1 Claim.

This invention relates to lens grinding machines, and has for the primary object the provision of a device of this character which will be substantially free of vibration and permits grind- 5 ing operations to be accurately and quickly carried out due to an arrangement wherein the work and the grinder are both reciprocated, one at right angles to the other.

With these and other objects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which I Figure l is a top plan view illustrating a lens grinding machine constructed in accordance with my invention.

Figure 2 is a side elevation illustrating the same.

Figure 3 is a rear elevation illustrating the machine.

Figure 4 is a fragmentary sectional view illustrating one of the adjustable couplings employed in the construction of the machine.

Referring in detail to the drawings, the numeral I indicates a table for supporting grinders or laps 2 of a well known conventional construction. The table is of substantially L-shape and has pivoted thereto three legs, numbered 3 in the drawings, a pair of which is secured to a shaft 4 journaled on a base 5 and the other leg is pivoted to the base, as shown at 4'. A depending arm 6 is secured to the table and is connected to a crank 'I of a crank shaft 8, by a link 9, whereby the rotation of the shaft will impart reciprocation to the table I. A drive shaft I is journaled on a support II carried by the base 40 and is connected to the crank shaft 8 by an endless belt I2 operating over pulleys I3, an idle pulley I4 also being provided for the belt and being suitably journaled to the support II. A power source I5 such as an electric motor or some other similar device is carried by the support II and is connected to the drive shaft II) by an endless belt I6 operating over pulleys I1. The drive shaft I0 is equipped with cranks I8 to which are journaled connecting arms l9 disposed horizontally over the base 5 during operation of the machine. Work holders 20 are connected to the arms I9 by couplings 2 I. The work holders are of a conventional construction supporting work to be engaged with the grinders or lap. The arms I9 have connected thereto braces 22 arranged to cross one another, as clearly shown in Figure 1. The braces are journaled on the cranks I8. The brace of each arm is connected to the crank of the other arm. The 5 couplings 2| permit the work holders to be moved into and out of operative position with respect to the grinders or lapsand each includes a cylinder 23, one end of which terminates in a reduced portion 24 suitably secured to the arm I9 10 while the opposite end of the cylinder 23 is apertured to receive a crank arm 25 to which the work holder is secured. The crank arm extends into the cylinder 23 and has secured thereto substantially conical-shaped bearing elements 26 15 engageable with annular seats 21, one of which is carried by the apertured end of the cylinder and the other carried by a plunger-like member 28 having a stem 29 fitting in the reduced portion 24 of the cylinder and engageable with a coil spring 30. The spring 30 acts to adjust the annular seats against the bearing elements 26 and thereby establish sufiicient friction between said bearing elements and their respective seats to assure the crank arm 25 remaining in any of its positions but which will permit said crank arm to be turned in either direction for adjusting the work holder carried thereby relative to the lap or grinder. The stem 29 is engaged by a set screw 3| carried by the reduced portion 24 of the cylinder whereby the plunger like member 28 may be adjusted and secured in any of its adjusted positions.

Tensioning means 32 is provided for each of the arms I9 acting to urge the work holders in the direction of the laps or grinders and each includes a coil spring 33 connected at one end to the arm I9 and the other end to a lever 34 pivoted to the base, as shown at 35. The lever 34 operates in conjunction with a toothed rack 36 mounted to the base whereby the tension of the spring may be varied and thereby permit the work holder to bring the work in engagement with the lap or grinder with varying forces. The arms I9 being connected to the cranks I8 will reciprocate the work holders and the work carried thereby relative to the laps or grinders and at right angles to the reciprocating movement of the laps or grinders which permits grinding operations to be accurately and rapidly carried out' and reducing vibration of the machine to a minimum. Also the arrangement of the braces permits one of the arms I9 to be elevated without affecting the other arm.

pivoted to said table and to the base whereby the table may be reciprocated, grinders carried by the table, a support carried by the base, a shaft journaled to said support and having cranks,

arms journaled to the cranks, Work holders journaled on said arms and; adapted to engage work with the grinders, means for increasing and decreasing friction on said work holders for controlling the freeness of said work holders with respect to the arms, means connecting the table to the shaft for the reciprocation of said table,

power means for driving said shaft; braces crossing each other and secured to the arms and 5 -journaled on the cranks of said shaft, springs connected to'said arms, and meansfor' arying the action of said springs independently of each other and mounted on the base.

J'OHN ALBERT'COOK. 

